Its easy! Just try out DivXMuxWiz.
DivXMux Wizard is a tool that was made by LangeCornu(Francois Gravel).
Here is what it can do:
- Resynchronize Audio track +- 1000ms
- Join together up to 4 DivX Clips
- Add Subtitles Tracks to a DivX file
- Add Audio Tracks to a DivX file
You can download it from here:
Here are some screenshots of the Program:
Add Audio Track Screen
Add Subtitles Track
Join Video Screen